Glucose isomers

Glucose syrups -—- food uses Glucose Isome rase... 

The L-idose derivative 98 gave a small proportion of the substitution product, and an attempt to improve its yield by protecting the 3-hydroxyl group by acetylation surprisingly did not prevent formation of the 3,6-anhydro ring, the substitution product being formed only in low yield. The D-glucose isomer of 98 could not be converted by... 

Fig. 7. Activity retention as a function of monomer concentration in the immobilized enzymes by radiation polymerization method. Enzyme a-amylase(— 24 °C, 1 x 106 rad) glucose isomer-ase (—45°C, 1 x 106 rad) O a-glucosidase (—78°C, 1 x 106 rad) A glucoamylase (—78CC, 1 x 106 rad). Monomer HEMA (2-hydroxyethyl methacrylate)...

In general, D-glucose isomerases require a divalent cation such as Co2+, Mg +, or Mn2+ for their catalytic action.40 The D-glucose isomer-ases usually function well in the pH range of 6.5 to 8.5, and at temperatures from 40°C (104°F) to as high as 80°C (176°F), depending upon the source of the enzyme. 

Fig. 11.10 Histogram of c7stallization hits for sparse matrix screens of model proteins. Number of screens tested on each protein are lysosyme (L)=2, glucose isomer-ase (Cl)=2, protease K (PK) = 1, bovine liver catalase (BLC) = 1, xylanase (X) = 2, bacterial primase catalytic core domain (BPC) = 3, bovine pancreas t7psin (BT) = 1, thaumatin (T) = l, mycobacterial RNase (MR)=3.

Even for the fructose-glucose isomer system, with liquid phase concentrations that are an order of magnitude higher than those of the enantiomer system, the transport dispersive model is valid. Figure 6.32 shows that experimental and theoretical concentration profiles for a pulse experiment match very well using the isotherm data of Eq. 6.182. Eight semi-preparative columns were connected in series to... 

Hartley B S, Hanlon N, Jackson R J, Rangrajan M (2000), Glucose isomer-ase insight into protein engineering for increased thermostability , Biochem. Biophys. Acta., 1543,294-335. 

Draw the structure of fructose in its ring form. Are fructose and glucose isomers ... 

There are two glucose isomers, differing only at carbon-1. 

Examine the Lewis structures of a-glucose and )3-glncose. What is the difference between these two glucose isomers ... 

Schenck, F. W. Glucose and glucose-containing syrups, in Ullmann s Encyclopedia of Industrial Chemistry (Wiley-VCH, Weinheim, 2006). (Structure of glucose isomers)... 

The action of xylose isomerase ( glucose isomer-ase , sweet-zyme ), D-xylose-ketol-isomemse, (EC 5.3.1.5.) isomerizes the aldoses D-xylose or D-glucose into the corresponding ketoses D-xylulose or D-fructose by passing the 1,2 enediol intermediate. The thermodynamically controlled process leads to equilibria of 84% D-xylose and 16% D-xylulose or 49% D-glucose and 51% D-fructose... 

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